Jaw crusher



G. T. GILBERT May 9, 1967 J AW CRUSHER Filed Dec. 16, 1964 FIG-1.4. 'FlClS.

FIG. 5.

GEORGE T.G1LBERT BY W K W' v ATTORNEY 3,318,540 JAW CRUSHER George T. Gilbert. Bayport, Minn., assignor to Poor & Company, Inc., Chicago, 111., a corporation of Delaware Filed Dec. 16, 1964, Ser. No. 418,754 5 Claims. (Cl. 241-217) This invention relates to jaw crushers and more particularly to an improvement in the mounting means for the spring biasing the tension rod attached to the lower end of the movable jaw.

Jaw crushers include a fixed jaw and a movable jaw. In connection with relatively light duty crushers, the position of the bottom end of the movable jaw where it engages with the toggle plate is regulated through the medium of a screw type jaw adjustment which includes a push-wedge and adjusting block-s. In this arrangement the operation of the screw and wedge means effects the holding of the movable jaw against the toggle plate, and, also, regulates the area of the discharge opening between the fixed and movable jaws. On the other hand, larger jaw crushers adapted for heavy duty employ what is known in the industry as the jack-and-shim jaw adjustment. Depending upon the number of shims used, the angularity of the bottom end of the movable jaw will vary thereby changing the angularity of the tension rod relative to the coil spring surrounding the same and abutting against a fixed support. This support on the crusher frame has a hole for the rod, and it often happens that the rod, due to change of its angular position, will strike the edge of the hole resulting in severe wear and breakage. Of concern at this point is the fact that as the longitudinal axis of the tension rod deviates from a perpendicular alignment with respect to the fixed support bracket on the crusher frame, the tension rod spring, which is biased at one end against this support bracket, will be likewise angularly displaced with respect to both its seating upon the support bracket and the tension rod passing through the convolutions of the spring. Thus, it will be understood that the numerous coils of the spring will be laterally displaced by various amounts and should the rod be displaced a sufiicient angle with respect to the fixed bracket support, it will be conceivable that the inner edge of the bracket hole would interfere with the tension rod, giving the results previously indicated.

Accordingly, the present invention provides a solution for the above problem by providing an adjustable tension rod spring support assembly wherein the portion of the rod spring biased against the frame support bracket is provided with an adjustable seat. In other words, since the correct perpendicular relationship between the tension rod, the spring, and its supporting seat can only be maintained for a single particular adjustment of the movable jaw, according to the number of shims employed, when this shim arrangement is changed the angular position of the rod and its spring also changes.

A more specific object of the invention is to provide an adjustable spring socket plate which abuts a fulcrum bar secured to the top of a bracket on the crusher frame and which pivots thereagainst by means of adjusting screws which are regulated to position the socket plate in a plane which is perpendicular to the longitudinal axis of the tension rod and tension spring after the proper adjustment has been made to the moving jaw plate.

With the above and other objects in view which will more readily appear as the nature of the invention is better understood, the invention consists in the novel construction, combination, and arrangement of parts hereinafter more fully described, illustrated and claimed.

A preferred and practical embodiment of the invention is shown in the accompanying drawings in which:

United States Patent O1 ice FIGURE 1 is a partial vertical cross sectional view of a well known heavy duty jaw crusher utilizing a hydraulic cylinder and shims to regulate the position of the toggle plate and movable jaw relative to the lower end of the fixed jaw.

FIGURE 2 is an enlarged detail side elevation, partly in section, of the improved adjustable support for the end of the tension spring adjacent the crusher frame.

FIGURE 3 is a detail plan view of the adjustable spring socket plate.

FIGURE 4 is. a side elevation of the plate shown in FIGURE 3 FIGURE 5 is a perspective view of the spring socket plate.

FIGURE 6 is a rear elevation of the frame bracket.

Similar reference characters designate like parts throughout the several figures of the drawing.

Referring first to the generally old construction shown in FIG. 1, it will be observed that thevtype of jaw crusher in which the present invention is to be incorporated includes a fixed jaw A and a movable jaw B whose lower end is held against 'a toggle plate C by a tension rod D and a tension rod spring E.

In the old construction, the end of the spring E seating against the crusher frame. had a fixed bearing surface on the frame. Therefore, depending on the selective length of the shim bank F, it will be seen that the angular position of the axisof the tension rod D and coil spring E would change relative to the planar surface of the fixed support bracket G.

Turning now to' FIG. 2, embodying the present improvements, it will be observed that the crusher frame H is provided with a depending fixed offset bracket plate 1 having spaced offset winglikebraces 2, and, also provided with a tension rod opening 3 having a diameter substantially greater than the diameter of the tension rod D.

The upper vertical portion of the bracket plate 1 is provided with a horizontal fulcrum bar 4 or its equivalent disposed above the area occupied by the convolutions of the tension spring B. One end of the tension rod D is pivotally connected in a conventional manner with the lower end of the moving jaw B while its opposite end is threaded to receive the usual nut and washer for compressing the spring.

The seating end of the spring E adjacent to crusher frame H is intended to cooperate with an adjustable spring socket member which includes a plate portion 5 whose upper edge is intended to engage the fulcrum bar 4. The lower edge portion of the socket plate 5 is provided with preferably a pair of adjusting screws 6 whose inner ends engage the bracket plate 1 while their outer ends are provided with beads for manipulation by a suitable adjusting tool. The medial portion of the plate 5 has tubular rod receiving collars 7 extending from opposite sides thereof to provide a rod passage having a longitudinal axis perpendicular to the plane of the spring seating surface 5a of the socket plate.

As will be seen from FIG. 2, one collar portion 7 enters the coil spring cavity while the opposite collar portion 7 enters the tension rod opening 3 in the bracket plate 1. It will thus be seen that the socket plate 5 is capable of free angular adjustment relative to the bracket plate 1 by the screws 6 to maintain co-axial relationship between the coil spring and the tension rod regardless of the change of their angular position with respect to the bracket plate due to changes in the shim bank.

That is to say, as the angular position of the jaw changes due to the use of a greater or lesser number of shims or by means of other adjustments of the movable jaw, the angular disposition of the rod also changes relative to the base or area where the bottom of the spring seats. Hence, as the thickness of the shim bank expands or contracts, it is possible to make the rod axis coincide with the spring axis in a simple and effective manner, while most importantly, maintaining these axes perpendicular 'to the seating surface 5a of the spring socket plate 5.

A positive footing for the socket plate is assured by means of the triangular or 3-point contact between the socket plate 5 and bracket plate 1. Two bearing points are formed by the laterally spaced-apart screws 6, 6 located at opposite corners adjacent the lower edge of the plate, while the thirdbearing surface is formed by the camming surface 5b extending across the entire upper inside edge of the plate. The efl -ort required to regulate the screws 6, 6 is surprisingly littlein view of the single points of contact between the camming surface 5b and bracket 1 and the top of the plate 5 and fulcrum bar 4.

It is to be understood that the invention is not limited to the specific features shown, but that the means of 7 construction herein disclosed comprise the preferred form of several modes of putting the invention into effect and the invention will therefore be understood in any of its forms or modifications. within the legitimate and valid scope of the appended claims.

I claim:

1. An adjustable tension rod spring support assembly for the movable jaw of a jaw crusher, said assembly including, a crusher frame part, a bracket fixed on said frame part and having an opening through which the tension rod passes to connect with the movable jaw, and means on the bracket adapted to maintain an axis of a coil spring surrounding the rod to coincide with the axis of the rod as the angular relationship of the rod changes with respect to said opening.

2. An adjustable tension rod assembly according to claim 1, wherein, the means on the bracket includes a socket plate for engaging the end of the spring nearest the jaw, and means for changing the angular position of the socket plate relative to the bracket to maintain axial alignment of the axis of the coil spring and rod.

3. An adjustable tension rod assembly according to claim 2, including, a fixedly disposed fulcrum bar against which the upper portion of said socket plate abuts, and screw means on the lower portion of said socket plate for engaging the bracket to alter the angular position of said plate.

4. An adjustable tension rod assembly according to claim 3, wherein, the socket plate has a collar portion which surrounds the tension rod.

5. In a jaw crusher including a frame having fixed and movable jaws, the movable jaw actuated at its upper end by an eccentric and the lower end of which is spring urged by a tension rod against a toggle plate whose major adjustment is effected by shims, the combination comprising, a fixed bracket on the frame and having an opening through which said rod normally is centered,'and support means cooperating with the fixed bracket for maintaining the coaxial arrangement of the rod and spring in accordance with adjustment of the shim bank to maintain said axes perpendicular to said support means.

References Cited by the Examiner UNITED STATES PATENTS 1,620,078 3/1927 Cookinham 241268 2,532,678 12/1950 Shelton 241-217 2,598,942 6/ 1952 Rumpel 241217 3,166,259 1/1965 Archer 241 219 FOREIGN PATENTS 703,533 1941 Germany.

WILLIAM W. DYER, JR., Primary Examiner.

R. ZLOTNIK, Assistant Examiner. 

1. AN ADJUSTABLE TENSION ROD SPRING SUPPORT ASSEMBLY FOR THE MOVABLE JAW OF A JAW CRUSHER, SAID ASSEMBLY INCLUDING, A CRUSHER FRAME PART, A BRACKET FIXED ON SAID FRAME PART AND HAVING AN OPENING THROUGH WHICH THE TENSION ROD PASSES TO CONNECT WITH THE MOVABLE JAW, AND MEANS ON THE BRACKET ADAPTED TO MAINTAIN AN AXIS OF A COIL SPRING SURROUNDING THE ROD TO COINCIDE WITH THE AXIS OF THE ROD AS THE ANGULAR RELATIONSHIP OF THE ROD CHANGES WITH RESPECT TO SAID OPENING. 